What is the initial action you should take when returning blood manually?

When returning blood manually, the first action you should take is to remove the venous line from the air detector. This step is crucial because it allows for the safe and effective return of the blood to the patient without any air being introduced into the circuit. The air detector, used to monitor for air in the lines, can prevent the manual return of blood if it detects any air, so ensuring that this line is disconnected is necessary to facilitate the process.

By removing the venous line from the air detector, you are allowing the blood to flow freely back to the patient, while also minimizing any risk that may arise from air embolism or complications related to the presence of air in the bloodstream. This action provides immediate access to the return of blood, ensuring that the patient's treatment can proceed smoothly and without interruption.